Opening another fxml on top as pop up

Question

I currently use this code to change scenes in my JFX program:

public void addTaskFunction (ActionEvent event) throws IOException{
        Parent addTaskParent = FXMLLoader.load(getClass().getResource("/LogIn/AddDataToTaskManager.fxml"));
        Scene addTaskScene = new Scene(addTaskParent);
        Stage appStage = (Stage) ((Node) event.getSource()).getScene().getWindow();
        appStage.setScene(addTaskScene);
        appStage.setResizable(true);
        appStage.show();
    }

Using this code closes the previous stage and opens a new one on top. How can I make it so the previous stage does not close and this AddDataToTaskMaager.fxml opens on top of TaskManager.fxml

Thank you

Answer 1

I changed the code with tips from @kai

public void addTaskFunction (ActionEvent event) throws IOException{
        Parent addTaskParent = FXMLLoader.load(getClass().getResource("/LogIn/AddDataToTaskManager.fxml"));
        Scene addTaskScene = new Scene(addTaskParent);
        Stage stage = new Stage();
        stage.setTitle("Thank You");
        stage.setScene(addTaskScene);
        stage.show();
    }